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Topic: Double declutch

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	Double declutch - Encyclopedia, History, Geography and Biography
		The purpose of the double declutch is to match the speed of the rotating parts of the gearbox for the gear you wish to select to the speed of the input shaft being driven by the engine.
		To perform a double declutch, the clutch pedal is pressed and the gearbox shifted into neutral.
		A related technique is called Heel-and-Toe, in which the double declutch is performed while braking (braking and changing to a lower gear on entry to a bend for example).
	www.arikah.com /encyclopedia/Double_declutch (367 words)

	double information. (Site not responding. Last check: 2007-10-18)
		double boiler a saucepan with a detachable upper compartment heated by boiling water in the lower one.
		double entry a system of bookkeeping in which each transaction is entered as a debit in one account and a credit in another.
		double helix a pair of parallel helices with a common axis, esp. in the structure of the DNA molecule.
	www.open-find.com /d/double.html (1031 words)

	Double clutch - Wikipedia, the free encyclopedia
		A double clutch (also called a double declutch) is a driving procedure used for vehicles with an unsynchronized manual transmission.
		Before the introduction of synchronizers and automatic transmissions, double declutching was the only way to drive an automobile.
		The purpose of the double clutch is to match the speed of the rotating parts of the gearbox for the gear you wish to select to the speed of the input shaft being driven by the engine.
	en.wikipedia.org /wiki/Double_declutch (399 words)

	Double declutch -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-18)
		The purpose of the double declutch is to match the speed of the rotating parts of the gearbox for the gear you wish to select to the speed of the input shaft being driven by the (Motor that converts thermal energy to mechanical work) engine.
		To perform a double declutch, the (A coupling that connects or disconnects driving and driven parts of a driving mechanism) clutch pedal is pressed and the gearbox shifted into neutral.
		A related technique is called (Click link for more info and facts about Heel-and-Toe) Heel-and-Toe, in which the double declutch is performed while braking (braking and changing to a lower gear on entry to a bend for example).
	www.absoluteastronomy.com /encyclopedia/d/do/double_declutch.htm (386 words)

	Double declutch (Site not responding. Last check: 2007-10-18)
		The purpose of the double declutch is to match the speed of the rotating parts of the gearbox for the gear you wish to selectto the speed of the input shaft being driven by the engine.
		To perform a double declutch, the clutch is pressed and the gearbox shifted intoneutral gear.
		A related manoeuvre is Heel-and-Toe, in which the double declutch isperformed while braking (braking and changing down on entry to a bend for example).
	www.therfcc.org /double-declutch-26518.html (321 words)

	TCS Racing - Racing Tips - Double Declutching
		Double declutching (sometimes spelt double de-clutching) is a technique that, if done properly, allows you to down shift smoothly using a manual transmission.
		Double declutching will also reduce wear and tear on your synchros even if you have good ones, increasing the life of your transmission.
		Note however that double declutching is a lot easier to learn than the heal and toe technique and if you plan to do both together you may be better off learning this first, then moving on to the other.
	www.tcsracing.org /doubledeclutching.htm (1104 words)

	NASIOC - Double clutching?
		Which means that unless you master the art of precise rev matching (double clutching), you not only are not going to get the gears engaged, but you are also risking damaging the gearbox by grinding the gears.
		I habitually double declutch at all times in any weather and although I would be first to admit that this is not always called for, this habit of mine is probably the only reason why I have never had a single gearbox breakdown on any of my cars.
		With a bit of a practice, you should be able to do the double declutching downshifts in under 2 seconds.
	forums.nasioc.com /forums/showthread.php?t=285695 (2085 words)

	Heel & Toe article by EVO's John Barker
		If you bring the clutch up in neutral when you blip on a change down (double declutching) you are more closely matching the speed of the cogs in the gearbox so the synchromesh has less work to do.
		While declutching, if instead you ease back the throttle slightly (just enough so that when you dip the clutch, which unloads the engine, the engine speed doesn't speed up for that reason alone), the throttle will remain fairly close to the correct point for the lower gear.
		Double de-clutch should not be necessary as part of Heel and Toe in a modern car.
	www.pistonheads.com /gassing/topic.asp?h=2&f=23&t=182005 (1501 words)

	Re: Rev matching not necessary?
		Double declutching involves putting in the clutch, shifting into neutral, releasing the clutch, then hitting the throttle pedal, depressing the clutch a second time, shifting into the lower gear, releasing the clutch pedal.
		It is even quicker than the double declutch, though not by much when a practiced driver is doing it.
		The "blip" technique is what I use on my car because it has the syncros, so there really is not much point to doing the double declutch on it, and that is what I was trying to describe, perhaps inartfully, in the first post.
	forums.freshalloy.com /ubbthreads/printthread.php?Board=UBB25&main=67820761&type=post (632 words)

	Beyond.ca - Car Forums - Anybody "Double Shift"
		i double clutch my downshifts when im daily driving, but it is slower and wastes the clutch more.
		Double clutch, shit i dont even clutch coming out of a gear only going in.
		When you double clutch you are taking disengaging the tranny from a low rpm and you need it to be spinning faster because you are going to a lower gear (shorter gearing).
	forums.beyond.ca /showthread.php?threadid=36907 (1436 words)

	Gearbox - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-18)
		Here, the selected gear is brought directly into mesh, and any others are not involved.
		Driving a vehicle with such a gearbox requires considerable skill, including mastering the technique known as double declutching.
		In a synchromesh gearbox, gears can freely rotate or be locked to the shaft on which they are carried.
	www.encyclopedia-online.info /Gearbox (390 words)

	GMInsideNews Forums - Double Clutching
		Normally I would declutch, move the stick to fourth and re-engage the clutch, which would force the clutch disc and input shaft to speed up from ~2500rpm to let's say 3400rpm instantly.
		To double clutch, I would declutch, shift to neutral, engage the clutch, rev ("blip") the motor to 3300rpm, declutch, move to fourth, engage clutch and smoothly let off the throttle to slow down.
		As there was NO synchro, you either learned to double clutch, or the transmission took a lot of abuse in a big hurry.
	www.gminsidenews.com /forums/printthread.php?t=8086 (865 words)

	Double-Clutching VS Granny Shifting - Driving Style and Technique - Car Discussion Forums - Helping the Automotive ...
		umm hello we already talked about double clutching (or double declutching as they call it on that site) so yes of course we know the technique exists, we even mentioned is required on trans cases with bad or no syscros.
		This technique is often confused with double declutching which is a seperate process that can be used to assist your shifting...
		double clutching isn't used in drag racing, it is a technique that aids in downshifting.
	www.automotivehelper.com /topic388960.htm (1528 words)

	Dictionary double (Site not responding. Last check: 2007-10-18)
		, dual, duple -- consisting of or involving two parts or components usually in pairs; "an egg with a double yolk"; "a double (binary) star"; "double doors"; "dual controls for pilot and copilot"; "duple (or double) time consists of two (or a multiple of two) beats to a measure"
		, doubled, twofold -- twice as great or many; "ate a double portion"; "the dose is doubled"; "a twofold increase"
		, twice -- to double the degree; "she was doubly rewarded"; "his eyes were double bright"
	www.dictionarydefinition.net /double.html (410 words)

	Double declutch - Encyclopedia Glossary Meaning Explanation Double declutch (Site not responding. Last check: 2007-10-18)
		Double declutch - Encyclopedia Glossary Meaning Explanation Double declutch.
		Here you will find more informations about Double declutch.
		The orginal Double declutch article can be editet
	www.encyclopedia-glossary.com /en/Double-declutch.html (397 words)

	Toyota Owners Club - UK Toyota Car Club > Double Declutching
		Mar 16 2004, 03:15 PM The real idea behind double declutching is that, when you blip the throttle with the car in neutral, you match the engine revs with the same amount that your car would be doing at your current speed, albeit in a lower gear.
		The real idea behind double declutching is that, when you blip the throttle with the car in neutral, you match the engine revs with the same amount that your car would be doing at your current speed, albeit in a lower gear.
		Mar 23 2004, 11:24 AM Doublt declutching is when you shift into neutral between gears and drop the clutch, before pressing it again to select the next gear.
	www.toyotaownersclub.com /forums/lofiversion/index.php/t12438.html (3756 words)

	PH: Double de clutching / Sliding
		I usually double declutch on downchanges, it's better for the gearbox and the clutch, and also sounds good in an S! As for getting used to getting the tail out, well a lot depends on your car's suspension setup, the type of tyres and the amount of wear etc...
		Double de-clutching is a waste of time unless you have a knackered gearbox.
		I also agree that if you're in a hurry it is kinder on the transmission to double declutch than risk beating the synchros and grinding metal.
	www.pistonheads.com /gassing/topic.asp?f=11&t=135309 (2231 words)

	Alfa Romeo Bulletin Board & Forum - Double clutch or not?! (Site not responding. Last check: 2007-10-18)
		i have read in many places where double clutch is recommanded for taking a better care of the second gear synchro, or the gear box in general, even when down shifting.
		Although there may be a minute amount of additional wear on the clutch when double clutching, the engine will have to be rebuilt long before the clutch wears out from double clutching.
		Double clutching really is a last resort for worn out syncros.
	www.alfabb.com /bb/forums/arc/topic/2464-1.html (1197 words)

	Double clutching - Engineering/Technical - Automotive Forums .com Car Chat- A Message Board for Every Make and Model
		Upshifting is a double-clutch, downshifting is a double declutch with a throttle blip in Neutral?
		I've never blipped the throttle when shifting to first (Subaru 360 has unsynced 1st gear) of course this is usually because I come to a stop before engaging it.
		I think a well-executed single/double clutch upshift or double clutch downshift will be overall faster than power shifting, sound cooler, and certainly put less pressure on the drivetrain.
	www.automotiveforums.com /t124856-double_clutching.html (587 words)

	Car Forums - Anybody "Double Shift" - beyond.ca car forums
		This procedure causes the input shaft on the transmission to speed up so that the relative speeds of the gears are closer when you actually engage the lower gear.
		It's a much more important procedure when operating a heavy vehicle such as a 3 or 5 ton truck, and also allows shifting of transmissions with straight cut non-synchro gears, like the 1st gear in earlier heavy duty pickups (1981 F-350 for example).
		Think the point is to rev and match engine/transmission speed while your shifter is in neutral.
	forums.beyond.ca /showthread/t-36907.html (1775 words)

	Re: double de-clutching
		Which means that unless you master the art of precise rev-matching (double clutching), you not only ain't gonna get the gears engaged, but also risk damaging the gearbox by grinding the gears.
		Let's use two different terms: "Double clutching" on the upshift: lift off => depress the clutch => switch into neutral => release the clutch => depress the clutch => switch into a higher gear => release the clutch => step on the gas.
		I habitually double declutch at all times in any weather and although I would be first to admit that it is not always necessary, this habit of mine is probably the only reason why I have never had a single gearbox breakdown on any of my cars.
	www.audifans.com /archives/1998/06/msg00792.html (1017 words)

	RE: Double declutch WAS RE: sequential shift transmission conversion!
		RE: Double declutch WAS RE: sequential shift transmission conversion!
		Double declutch WAS RE: sequential shift transmission conversion!
		Prev by thread: Re: Double declutch WAS RE: sequential shift transmission conversion!
	www.scirocco.org /list/archives/2001/October/msg02015.html (423 words)

	FASTDRIVING - FAST Driving - FAST Roads - FAST Police
		In modern cars it is not necessary to use double declutching unless you really want to be a professional.
		The idea is that double declutching matches the engine speed to the speed of the car so that when you change your gear and bring up the clutch the car does so in a smooth manner and not jerky like most times.
		That is double declutching the only time you will do it without thinking is if you have a sticky gearbox or you just cant get it into gear.
	www.geocities.com /gatsovtr/doubledeclutch.html (234 words)

	Why does a stick stops faster than a Auto? - General Chat - Car Forum Archives
		Double de clutching involves stopping in neutral and letting the clutch up with the engine at idle to slow the gears down.
		The main reason for using them on tractors and trucks is the number of gears that you would a have to mesh typical truck has 16-20 gears and a tractor has 40+ forward and the same in reverse.
		Double clutching is simply a method used, to be able to move from one gear to another by matching the speed of the input shaft with the gear set, being selected inside the transmission.
	www.car-forums.com /s7/t3861.html (4802 words)

	Alfa Romeo
		At the end of the 1970s, a general economical crisis caused the government to sell Alfa Romeo to Fiat, which still owns it.
		Since the 1960s, Alfa Romeo cars have a particular "fault": second gear (manual) is very hard to enter, so it needs the driver to pass just for a fraction of second through the neutral gear (both in acceleration or in deceleration).
		This manoeuvre, called the "doppia" or "double Débraillée" (double declutch), distinguishes real drivers from "Sunday" ones.
	www.brainyencyclopedia.com /encyclopedia/a/al/alfa_romeo.html (619 words)

	DOUBLE (Site not responding. Last check: 2007-10-18)
		Search the DOUBLE Family Message Boards at Ancestry.com (if available).
		Search the DOUBLE Family Resource Center at RootsWeb.com (if available).
		Find graves of people named DOUBLE at Find-a-Grave.com (or add one that you know).
	www.worldhistory.com /surname/US/D/DOUBLE.htm (73 words)

	RE: heel/ toe,double shuffle Errol/ List
		Double de-clutching allows the gears a little time to equalize speeds and mesh better, providing a quicker change on straight cut gears and less stress on components.
		I have rallied with a Datto four speed with a straight cut crash 2nd and 3rd and it was very reliable and very fast shifting with double declutching.
		I don't see any need to double declutch on the road or with a std box, but I certainly would if using a box that you want to look after.
	www.mail-archive.com /membersozdat@datascribe.com.au/msg08008.html (315 words)

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